Refactor over-length functions into ~30-line helpers (vr0)

Pure, behavior-preserving refactor: extract _-prefixed helpers from six
functions that exceeded the project's 50-line threshold, leaving each
original as a thin orchestrator. Generated HTML, dry-run output,
shuriken.json, EXIF cache behavior and the flush-grid layout are all
byte-identical (full test suite green).

Refactored:
- _generation_metadata_json -> _generation_metadata_json_head +
  _generation_metadata_json_settings
- print_dry_run_plan -> _print_dry_run_settings + _print_dry_run_files
- _photo_exif_tooltip_text_from_values -> _collect_exif_tooltip_parts +
  _emit_exif_tooltip_parts
- cached_photo_identify_output -> _rebuild_photo_identify_cache
- render_album_pages -> _render_album_page (one page record)
- append_preview_grid -> _roll_and_align_page_tiles + _emit_page_tiles
  (uniquely-named namerefs to avoid circular-nameref)

Left intact (delicate errexit/trap management that must stay in one
function scope, where a split would change semantics):
source_template_file, refresh_splash, generate_staged,
replace_dist_with_staging.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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